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* [Bug tree-optimization/82494] UBSAN in gcc/tree-data-ref.c:3427:16: runtime error: signed integer overflow: 131072 * -131072 cannot be represented in type 'int'
       [not found] <bug-82494-4@http.gcc.gnu.org/bugzilla/>
@ 2021-09-20 11:03 ` pinskia at gcc dot gnu.org
  2021-09-20 11:40 ` rguenth at gcc dot gnu.org
  1 sibling, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-09-20 11:03 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82494

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
r9-3927 changed the type from int to HOST_WIDE_INT which is always at least
64bit ...

I also wonder if we could use wi::widest_int here.

^ permalink raw reply	[flat|nested] 2+ messages in thread
* [Bug tree-optimization/82494] UBSAN in gcc/tree-data-ref.c:3427:16: runtime error: signed integer overflow: 131072 * -131072 cannot be represented in type 'int'
       [not found] <bug-82494-4@http.gcc.gnu.org/bugzilla/>
  2021-09-20 11:03 ` [Bug tree-optimization/82494] UBSAN in gcc/tree-data-ref.c:3427:16: runtime error: signed integer overflow: 131072 * -131072 cannot be represented in type 'int' pinskia at gcc dot gnu.org
@ 2021-09-20 11:40 ` rguenth at gcc dot gnu.org
  1 sibling, 0 replies; 2+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-09-20 11:40 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82494

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #5)
> r9-3927 changed the type from int to HOST_WIDE_INT which is always at least
> 64bit ...
> 
> I also wonder if we could use wi::widest_int here.

That's prohibitively expensive (storage-wise).  Note propagating a failure
upwards should in theory be possible (but it's going to "hurt" - welcome C++
exceptions?)

^ permalink raw reply	[flat|nested] 2+ messages in thread
end of thread, other threads:[~2021-09-20 11:40 UTC | newest]

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     [not found] <bug-82494-4@http.gcc.gnu.org/bugzilla/>
2021-09-20 11:03 ` [Bug tree-optimization/82494] UBSAN in gcc/tree-data-ref.c:3427:16: runtime error: signed integer overflow: 131072 * -131072 cannot be represented in type 'int' pinskia at gcc dot gnu.org
2021-09-20 11:40 ` rguenth at gcc dot gnu.org

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